Piston-rod or other similar packing.



' no; 695,!95. Patented Mar. n, I902.

u. 0. CRONWALL. v PISTON ROD OR OTHER SIMILAR PACKING.

. (Application filed July 18, 1901.)

(No Model.)

W'umssw.

UNITED Smart es ATENT Prion.

NILS OLOF GRONWALL, OF HAMBURG, GERMANY.

PISTON-=ROD OR OTHER SIMILAR PACKING.

SPEOIFICATIQN forming part of Letters Patent No. 695,195, dated March 11, 1902. Application filed July 18,1901. Serial No. 68,861, (No model.)

To all whom it may concern:

Be it known that I, NILs OLOF CRONWALL, engineer, of 29 Rutschbahn, Hamburg, in the Empire of Germany, have invented new and useful Improvements Relating to Pistondtod or other Similar Packings, (for which patent applications have been made in Germany, filed June 14-, 1901, and in Great Britain, filed June 20,190l,) of which the following is a specification.

This invention relates to piston-rod and other similar packings, and has foritsobject to provide improved means whereby tight and durable joints may be made for pistonrods in the cylinder-cover or for other parts of machinery.

The ordinary manner of forming a tight joint for piston-rods by means of hemp, asbestos, or metallic alloys inserted in the stuffing-box has the objection of causing great wear of the piston-rod by friction, and

consequently the loss in power arising there from. All three modes of packing alfect the continuous working of the engine in so far that it is necessary to tighten such packings from time to time, whereby excessive tightening of the stufling-boxes often occurs. This excessive tightening is difficult and often impossible to properly control and produces undue heating of the pistonuod. Further more, with the methods of packing hitherto employed, especially when applied to marine engines, deviation of the piston'rod is not provided for, so that the one-sided stress thus produced on a very small frictional surface causes undue heating of the piston-rod.

All the above-mentioned objections are obviated according to this invention by the introduction into the stuffing-box of metal bushes pressed radially against the pistonrod by means of springs in such a manner that tightening or readjustment of the same will be unnecessary. On the contrary, the construction and arrangement is such as to insure a more and more tight joint with continuous service.

In order that my invention may be clearly understood and readily carried into elfeet, I will now proceed to describe the same more fully with reference to the accompanying drawings, in Which- I Figure 1 is a vertical section of a cylinder stu tfing-box provided with my improve-d packing device. Fig. 2 is a horizontal section through the same, taken on the line A B of Fig, 1. Fig. 3 is a plan, and Fig. tis an clevation, of my improved packing-bush.

The piston-rod Cl, is guided in a bottom ring I), disposed in the cylinder-coverc. Be-

low the ring I) the cylinder-cover is formed with a stuffing-box (Z, serving to receive the packing device.

The packing consists of a sleeve 6, longitudinally slotted in several places and adapted to be pressed against the piston-rod by means of springs f. On the inner face of the said packing sleeve 6 are formed circular oilgrooves e. In order to prevent steam passing through the slits (1, said sleeve 6 is preferably provided with end pieces h, which are prevented from peripheral displacement by means of pins 1 secured to the several sections of the packing-sleeve e. The packing-sleeve thus constructed is seated on a Washer or ring 7c, ground upon the bottom guide-ringb of the stuffing-box,and is pressed against the ring 7c by springs Z, held between two rings m and n in suitably-milled recesses formed in the adjacent faces of the latter. The back of the ring at rests againstaring o, movably disposed upon the piston-rod a, which ring 0 is secured to the stuffingbox cl of the cylinder-cover by means of bolts q, fixed in the flange p. The ring 0 and flangep are advantageously supplied with an asbestos packing to form a tight joint. The steam-tightness of this improved packing is insured by the fact that the sleevesections e, pressed against the piston-rod by the springs f, prevent steam escaping at that part. The slits g, formed by cutting the sleeve e, are closed bythe parts of the sectional ring 7L, and any steam which may pass through the bottom guide-ringb and washer c and through the latter and the packing-sleeve e is prevented from escaping by reason of the asbestos ring provided between the ring 0 and flange 99. The longer the engine works the better the packing-sleeve e becomes ground upon the piston-rod, so that there is no fear of thejointbecoming detective through long use. The circular oil-grooves 6' become gradually filled with oil, and thus not only serve in supplying lubrication, but also in providing a tight joint. As by lengthy,

use the joint becomes all the more perfect, it is unnecessary to readjust or tighten the stuffing-box, besides the arrangement of stufiingbox is such as not to admit of further tightening. The springsfpress the sleeve-sections a uniformly and in accordance with the wear against the piston-rod a, so that no attention need be given to the stuflingbox. By reason of the yielding or elastic disposition of the packing-sleeve it is capable of following any deviation of the piston-rod, and thus preventing the latter becoming overheated, owing to one-sided pressure.

What I do claim as my invention, and desire to secure by Letters Patent, is

1. In a device of the character described, a sleeve having a series of longitudinal slots formed on the periphery thereof,a ring mounted upon one end of said sleeve and securedthereto by pins, springs engaging in said slots and guided by the walls thereof, a ring engaging the other endof said sleeve, spiral springs one end of which engages said ring, a ring engaging the other ends of said spiral springs, and a ring movably mounted on the pistonrod which engages said last-named ring, substantially as described.

2. In a device of the character described, a sleeve composed of sections, the periphery of said sleeve being longitudinally slotted and having springs mounted therein, a ring secured by means of pins to one end of said sleeve, a ring recessed on one face engaging the other end of said sleeve, spiral springs secured in said recesses, a ring recessed on one face which en gages the other end of said spiral springs, and a ring movably mounted on the piston-rod and engaging said last-named ring, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

. NILS OLOF CRONWALL.

lVitnesses:

E. H. L. MUMMENHOFF, T. CHRIST. HAFERMANN. 

